Hi Zhar,
as above put any grievance in writing but first obtain a copy of the companies grievance procedure which will help you. Keep copies of everything you send and receive.
Check your contract of employment. Is there a company sick pay scheme?
Jen is right, your employer should make reasonable adjustments.
Looking ahead, consider the grievance meeting. Are you a member of a Union?
If so contact them for advice and representation at the meeting. If not, give some serious consideration to joining one either via the TUC website or mine which is a general one (so covers most occupations)
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It is not unreasonable for an employer to request access to your medical records although they must have a good reason to do so.
There will usually be at least 3 stages in a grievance procedure so if you don't get anywhere at stage 1 you can take it to the next stages. Make sure the company stick to the timescales which will be in the procedure.
Finally anyone who has had prior knowledge or involvement cannot hear the grievance although they may be present at the meeting and each stage should be heard by someone more senior to the last.
good luck, regards,
Paul